It was in a autumn morning of 1877, when Edison came to a magasine editor office from a place named Mero of U.S.
He is carefully holding a weird thing in his hand, which has a long metal bar on it and a rather big wheel and a gear attached to it.Edison turned the gear, and put a tin paper onto that round rim, putting a little needle, sang a lullaby to the rim.
After he has done this, the machine unimaginably repeated the song.
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